Asclepias speicosa. Showy milkweed is a perennial that spreads, but not as quickly as common milkweed. The flowers are beautiful! Can grow anywhere from 2-5' tall or more depending on the soil conditions. Stratify seeds or sow on cold ground in late fall. Directions for stratification are inside the packet. A beautiful species that is an excellent larval food plant for monarchs and a great pollinator nectar flower as well.